The Army Hour started before there was Armed Forces Radio. First on NBC radio then eventually being sent to hundreds of stations for the Sunday morning graveyard. In 1968 AFN Europe was 25. Here's their tribute, with a bunch of AFNers doing their share.
The Army Hour 1968: AFN Europe 25th anniversary.
It's not clear from this broadcast, but in 1943 the networks in Alaska and Panama were already broadcasting.
After I posted this, I found a 16th anniversary special (1961)produced by the Berlin station and run on the full network.
AFN 16th anniversary 1961
Did any of the other networks do documentary shows?